Apple has released AirPort Base Station Firmware Update 7.6.4 to correct three specific issues on all 802.11n AirPort base stations (AirPort Extreme, AirPort Time Capsule, and AirPort Express). It fixes a problem that could cause an intermittent loss of Wi-Fi connectivity with iOS devices and addresses an issue that could cause an AirPort Time Capsule to report that the backup disk is in use. Additionally, the update fixes an IPv6 Tunnel error that was introduced with Firmware Update 7.6.3. You can update your AirPort base station using AirPort Utility via either your Mac or an iOS device (with the free AirPort Utility app installed). Click or tap the base station with a red circle sitting to its right, then click the Update button on the Mac or tap Version > Download and Install on your iOS device. (Free, 728 KB)
Disable Caps Lock
If you find yourself pressing the Caps Lock key accidentally as much as I do, note that you can disable it entirely in Mac OS X. Open the Keyboard & Mouse preference pane, click the Modifier Keys button, and in the dialog that appears, select No Action from the Caps Lock pop-up menu. You could remap it to another modifier instead, but that might make using differently configured Macs more difficult.
AirPort Base Station Firmware Update 7.6.4
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No problems at this time. Will post again if something comes up.
Impact: An associated client may be able to cause an unexpected base station system termination
Description: An issue existed in the parsing of small frames with incorrect lengths. This issue was addressed by adding size checking to the parsing of small frames.